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<html>
<head>
<title> 缩放锯齿 </title>
<meta content="">
<style>
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
</head>
<body>
<canvas id="myCanvas"></canvas>
<script type="text/javascript">
function loadcanvas(){
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
context.scale(0.2,0.2);
var image = new Image();
image.src = $("#img_tmp").attr("src");
context.drawImage(image,0,0);
}
</script>
<img src='https://img-bbs.csdn.net/upload/201307/11/1373540076_354144.jpg' id='img_tmp' onload = 'loadcanvas();' width='100'/>
</body>
</html>